G.f.: exp( Sum_{n>=1} A119616(n)*x^n/n ) where A119616(n) = (sigma(n)^2 - sigma(n,2))/2.

Terms

a(0) =1a(1) =0a(2) =1a(3) =1a(4) =4a(5) =2a(6) =12a(7) =6a(8) =26a(9) =21a(10) =61a(11) =46a(12) =155a(13) =114a(14) =317a(15) =293a(16) =704a(17) =627a(18) =1539a(19) =1400a(20) =3149a(21) =3124a(22) =6469a(23) =6463a(24) =13341a(25) =13467a(26) =26271a(27) =27889a(28) =51970a(29) =55513